It should look the same as regular Adwaita on Xfce. The theme currently supports GTK-3.0 and GNOME Shell.
- May 31 2017

Yes, sorry. I only have GNOME Shell and GTK-3 themes (Xfce uses GTK-2). The GTK-2 theme is the same as the regular Adwaita and it doesn't even have a Xfwm theme. I should install Xfce and tweak it for Xfce as well.
- May 31 2017

Xfce explains it. I made this tweak to shrink the GNOME Windows as they are H-U-G-E by default. The Xfce (gtk-2) theme should be the same as regular Adwaita.